A ballon at a height of 80 m is ascending with a velocity of 30 m/ Sec , a body of mass 1 kg is dropped from it . When will the body reach earth surface?
kesavan
Aug 8, 2008, 10:14 AM
use s=ut+1/2at^2 ( downwards)
s=+80
u=-30
a=10
...
t>0 so u can get t=8sec